A Numerical Expression is an expression only using numbers.
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It means finding the value of the expression.
Calculating the value of the expression when you have substituted numerical values for the variables.
None of the expressions on that list is a numerical one.
Yes, numerical expressions can have the same value. For example, the expressions 2+3 and 5 both have the value of 5. Similarly, the expressions 2x3 and 6 both have the value of 6. In general, any two numerical expressions that evaluate to the same number will have the same value.
These two are both similar because they are both expressions.